The following images were taken with the Canon Ixus 860 IS / PowerShot SD870. The
Canon was set to Large Superfine mode with Auto White Balance, Evaluative metering and with My Colours disabled. Each image here was shot handheld using the camera's Image Stabilisation.

The crops are taken from the original files, reproduced at 100% and saved in
Adobe Photoshop CS2 as JPEGs with the default Very High quality preset, while
the resized images were made in Photoshop CS2 and saved with the default High
quality preset.

The three crops are typically taken from far left, central and
far right portions of each image.

Our next indoor sample was taken with the sensitivity increased to 800 ISO. Darker conditions meant using a shutter speed of 1/15, but the camera's IS system eliminated any camera shake.

The crops reveal an inevitable increase in visible noise, but the impressive thing is how much detail remains. We'd say this is certainly usable for smaller prints and could also stand up reasonably well to third-party noise reduction software after the event.